20966216236 has 72 divisors (see below), whose sum is σ = 44212162176. Its totient is φ = 8665251840.

The previous prime is 20966216179. The next prime is 20966216239. The reversal of 20966216236 is 63261266902.

It is a junction number, because it is equal to n+sod(n) for n = 20966216192 and 20966216201.

It is not an unprimeable number, because it can be changed into a prime (20966216239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1774380 + ... + 1786156.

It is an arithmetic number, because the mean of its divisors is an integer number (614057808).

Almost surely, 2^20966216236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20966216236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22106081088).

20966216236 is an abundant number, since it is smaller than the sum of its proper divisors (23245945940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20966216236 is a wasteful number, since it uses less digits than its factorization.

20966216236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12119 (or 12110 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 20966216236 in words is "twenty billion, nine hundred sixty-six million, two hundred sixteen thousand, two hundred thirty-six".